Cleanups and making distinction between pro and enterprise (#3250)

# Description of Changes

Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: a <a>

src/main/java/stirling/software/SPDF/controller/api/security/RemoveCertSignController.java

@@ -1,7 +1,6 @@
 package stirling.software.SPDF.controller.api.security;
 
 import java.util.List;
-import java.util.stream.Collectors;
 
 import org.apache.pdfbox.pdmodel.PDDocument;
 import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
@@ -59,7 +58,7 @@ public class RemoveCertSignController {
             List<PDField> fieldsToRemove =
                     acroForm.getFields().stream()
                             .filter(field -> field instanceof PDSignatureField)
-                            .collect(Collectors.toList());
+                            .toList();
 
             if (!fieldsToRemove.isEmpty()) {
                 acroForm.flatten(fieldsToRemove, false);

src/main/java/stirling/software/SPDF/controller/api/security/SanitizeController.java

@@ -66,13 +66,13 @@ public class SanitizeController {
         }
 
         if (removeXMPMetadata) {
-        	sanitizeXMPMetadata(document);
+            sanitizeXMPMetadata(document);
         }
 
         if (removeMetadata) {
-        	sanitizeDocumentInfoMetadata(document);
+            sanitizeDocumentInfoMetadata(document);
         }
-      
+
         if (removeLinks) {
             sanitizeLinks(document);
         }
@@ -158,7 +158,7 @@ public class SanitizeController {
             }
         }
     }
-    
+
     private void sanitizeDocumentInfoMetadata(PDDocument document) {
         PDDocumentInformation docInfo = document.getDocumentInformation();
         if (docInfo != null) {
@@ -167,8 +167,6 @@ public class SanitizeController {
         }
     }
 
-
-
     private void sanitizeLinks(PDDocument document) throws IOException {
         for (PDPage page : document.getPages()) {
             for (PDAnnotation annotation : page.getAnnotations()) {